An air carrier CL65 flight crew has an initial unsafe indication on the nose gear, but 10 seconds later the gear showed safe and the flight crew landed normally.

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Attributes
ACN	347967
Time
Date	199609
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ict
State Reference	KS
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : ict
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi pilot : instrument pilot : commercial
Experience	flight time last 90 days : 210 flight time total : 10000 flight time type : 450
ASRS Report	347967
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	aircraft : equipment problem dissipated flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While on approach to ict attempted to extend landing gear. Nose gear showed an unsafe condition. After 10 seconds nose gear extended by itself and showed down and locked. We requested the crash fire rescue equipment equipment as a precaution. The landing was without incident and we taxied to the gate. Maintenance checked out the aircraft and we ferried to cvg gear down.

Original NASA ASRS Text

Title: AN ACR CL65 FLC HAS AN INITIAL UNSAFE INDICATION ON THE NOSE GEAR, BUT 10 SECONDS LATER THE GEAR SHOWED SAFE AND THE FLC LANDED NORMALLY.

Narrative: WHILE ON APCH TO ICT ATTEMPTED TO EXTEND LNDG GEAR. NOSE GEAR SHOWED AN UNSAFE CONDITION. AFTER 10 SECONDS NOSE GEAR EXTENDED BY ITSELF AND SHOWED DOWN AND LOCKED. WE REQUESTED THE CFR EQUIP AS A PRECAUTION. THE LNDG WAS WITHOUT INCIDENT AND WE TAXIED TO THE GATE. MAINT CHKED OUT THE ACFT AND WE FERRIED TO CVG GEAR DOWN.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.